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82 lines
2.8 KiB
Groff
82 lines
2.8 KiB
Groff
.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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.\" DAMAGE.
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.\"
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.Dd September 9, 2019
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.Dt VM_PAGE_WIRE 9
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.Os
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.Sh NAME
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.Nm vm_page_wire ,
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.Nm vm_page_unwire ,
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.Nm vm_page_unwire_noq
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.Nd "wire and unwire pages"
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/vm_page.h
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.Ft void
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.Fn vm_page_wire "vm_page_t m"
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.Ft bool
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.Fn vm_page_wire_mapped "vm_page_t m"
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.Ft void
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.Fn vm_page_unwire "vm_page_t m" "int queue"
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.Ft bool
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.Fn vm_page_unwire_noq "vm_page_t m"
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.Sh DESCRIPTION
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The
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.Fn vm_page_wire
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and
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.Fn vm_page_wire_mapped
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functions wire the page, which prevents it from being reclaimed by the page
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daemon or when its containing object is destroyed.
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Both functions require that the page belong to an object.
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The
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.Fn vm_page_wire_mapped
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function is for use by the
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.Xr pmap 9
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layer following a lookup.
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This function may fail if mappings of the page are concurrently
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being destroyed, in which case it will return false.
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.Pp
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The
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.Fn vm_page_unwire
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and
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.Fn vm_page_unwire_noq
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functions release a wiring of a page.
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The
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.Fn vm_page_unwire
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function takes a queue index and will insert the page into the
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corresponding page queue upon releasing its last wiring.
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If the page does not belong to an object and no other references
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to the page exist,
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.Fn vm_page_unwire
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will free the page.
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.Fn vm_page_unwire_noq
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releases the wiring and returns true if it was the last wiring
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of the page.
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.Sh AUTHORS
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This manual page was written by
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.An Chad David Aq Mt davidc@acns.ab.ca .
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